.clear::after {
    content: "";
    display: block;
    clear: both;
   }
  *{
      margin: 0;
      padding: 0;
      list-style: none;
      
    }

    .row{
      margin: 0;
    }
    
    .shouhang {
      background-color: rgba(50,54,67);
      height: 80px;
      line-height: 80px;
      box-sizing: border-box;
      color: white;
    }
    .icon-ziliaoku {
    float: left;
      margin:0 10px 0 25px;
    }
    .shouhang>p {
      float: left;
      font-size: 25px;
      margin-bottom: 0;
    }
    #yonghu{
      float: right;
      margin-right: 2%;
      color: rgb(102,102,102);
      cursor: pointer;
    }
    #yonghu>div{
      float: left;
      width: 30px;
      height: 30px;
      margin-right: 10px;
    }
    #yonghu>div::after{
      content: '';
      display: block;
      clear: both;
    }
    #yonghu>div>img{
      width: 100%;
      border-radius: 100%;
    }
    #yonghu>span:hover{
      color: white;
    }
    .caidan {
      padding: 0;
      color: white;
      background-color: rgba(50,54,67);
      font-size:20px;
      line-height: 50px;
      cursor: pointer;
      box-sizing: border-box;
      border: 1px solid rgba(50,54,67);
     
    }
    .caidan p{
      border-top: 0.05px solid white;
      border-bottom: 0.05px solid white;
      margin-bottom: 0;
      text-align: center;
    }
    .caidan a{
      color: white;
      text-decoration: none;
    }

    .caidan p:hover {
      background-color: rgb(253,189,4);
      color:black;
    }
   